I've personally seen rot from junky DVDs. I'm pretty sure the that the actual data isn't redundantly stored on a DVD. On CDs data is stored better, because you'

I've personally seen rot from junky DVDs. I'm pretty sure the that the actual data isn't redundantly stored on a DVD. On CDs data is stored better, because you're going to hear the difference if a small block of data is missing vs watching it. Similar evidence has been stated before, and be sure to read the pdf in the last paragraph. [1] [1] http://www.theguardian.com/technology/askjack/2012/feb/23/ask-jack-backup-data-storage http://www.theguardian.com/technology/askjack/2012/feb/23/as...